Prepare release notes for 2026.05 release (#349)

* Prepare release notes for 2026.05 release

* Apply suggestions from code review

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Fix up tense and such

* The name is "Open VSX" with a space

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: juliasilge

extensions.qmd

@@ -96,7 +96,7 @@ Extensions can offer Positron powerful new capabilities. However, they can also
 
 Positron has no control over the behavior of third-party extensions, including how they manage your personal data. You should only install third-party extensions if you trust the publisher. 
 
-OpenVSX has several mechanisms in place to help protect users, including requiring membership within a [namespace to publish](https://github.com/eclipse/openvsx/wiki/Namespace-Access) and displaying a Verified Publisher badge for specific, verified namespaces.
+Open VSX has several mechanisms in place to help protect users, including requiring membership within a [namespace to publish](https://github.com/eclipse/openvsx/wiki/Namespace-Access) and displaying a Verified Publisher badge for specific, verified namespaces.
 
 For example, Posit’s Air extension displays the “Posit Software, PBC” Verified Publisher badge, and “lionel-”, the developer from Posit who published the extension.
 
@@ -114,6 +114,6 @@ Additionally, when you first install an extension from a namespace you have not
 
 ![Modal prompt to confirm trust in that specific extension publisher](images/extension-publisher-trust.png){width=500}
 
-OpenVSX removes known malicious extensions and also makes use of the extension blocklist from the VS Code marketplace. To report suspicious or questionable extensions, or to report abuse, please reach out to OpenVSX via their [security portal](https://github.com/eclipse/openvsx/security) or via the “Report Abuse” button on the specific extension’s page of OpenVSX.
+Open VSX removes known malicious extensions and also makes use of the extension blocklist from the VS Code marketplace. To report suspicious or questionable extensions, or to report abuse, please reach out to Open VSX via their [security portal](https://github.com/eclipse/openvsx/security) or via the “Report Abuse” button on the specific extension’s page of Open VSX.
 
 For more information about the full set of extension privileges and security that come from upstream Code OSS, please see the VS Code documentation on [Extension runtime security](https://code.visualstudio.com/docs/configure/extensions/extension-runtime-security).

migrate-vscode.qmd

@@ -37,7 +37,7 @@ If you skip this step, you can import settings at any time by running the _Prefe
 
 Positron supports many extensions that you use in VS Code. These extensions can be installed using the Extensions pane, found in the Positron sidebar.
 
-If an extension does not appear in your search, it may be unavailable on the extension marketplace that Positron uses, [OpenVSX](https://open-vsx.org/). You can contact the developer of that extension to [request its publication to OpenVSX](extensions.qmd#open-vsx) for installation in Positron.
+If an extension does not appear in your search, it may be unavailable on the extension marketplace that Positron uses, [Open VSX](https://open-vsx.org/). You can contact the developer of that extension to [request its publication to Open VSX](extensions.qmd#open-vsx) for installation in Positron.
 
 ::: callout-note
 Positron comes bundled with several useful extensions, including those for Quarto, Jupyter notebooks, and Pyright. It also includes built-in extensions to enable language features. More information about these default extensions can be found in the [Extensions documentation](extensions.qmd#included-extensions).